General Description
The MAX5407 SOT-PoT™ is a logarithmic taper digital potentiometer with 32 tap points that has 1dB steps between taps. This device is ideal for audio applica-tions, such as volume control and fading/balancing audio signals.
The MAX5407 consists of a resistor string and CMOS switches that are digitally controlled through a simple 2-wire rial interface. This device performs the same function as a mechanical potentiometer. The device has a fixed end-to-end resistance of 20k Ωand features zero-crossing detection to minimize the audible noi generated by the wiper transitions.
This device has nominal resistor temperature coefficients of 35ppm/°C end-to-end and 5ppm/°C ratiometric. The MAX5407 is available in a space saving 8-pin SOT23package and is guaranteed from -40°C to +85°C.
Applications
Audio Volume Control
Fading/Balancing Audio Signals Mechanical Potentiometer Replacement
Features
o Miniature 3mm x 3mm 8-Pin SOT23 Package o Logarithmic Taper with 1dB Steps Between Taps o 32 Tap Positions
o Low 0.35µA Supply Current
o +2.7V to +5.5V Single-Supply Operation o Zero-Crossing Detection to Minimize Audible Clicks During Wiper Transitions o Simple Up/Down 2-Wire Serial Data Interface o Power-On Ret
Wiper Goes To Maximum Attenuation (Lowest Tap Position)o 20k ΩEnd-to-End Resistance
MAX5407
32-Tap Audio Logarithmic Taper
家装设计师Digital Potentiometer
________________________________________________________________Maxim Integrated Products 1
Pin Configuration
Ordering Information
Functional Diagram
如何加水印
19-2196; Rev 0; 10/01
For pricing, delivery, and ordering information,plea contact Maxim/Dallas Direct!at 1-888-629-4642, or visit Maxim’s website at
SOT-PoT is a trademark of Maxim Integrated Products, Inc.
M A X 5407
32-Tap Audio Logarithmic Taper Digital Potentiometer
ABSOLUTE MAXIMUM RATINGS
ELECTRICAL CHARACTERISTICS
(V DD = +2.7V to +5.5V, V H = V DD , V L = 0, T A = T MIN to T MAX , unless otherwi noted. Typical values are at V DD = +5V and T A = +25°C.)(Note 1)
Stress beyond tho listed under “Absolute Maximum Ratings” may cau permanent damage to the device. The are stress ratings only, and functional operation of the device at the or any other conditions beyond tho indicated in the operational ctions of the specifications is not implied. Exposure to absolute maximum rating conditions for extended periods may affect device reliability.
V DD -0.3V to +6V H, W, L, CS, ZCEN , and U/D .-0.3V to (V DD + 0.3V)Input and Output ±200mA Maximum Continuous Current into H, L, ±500µA Continuous Power Dissipation (T A = +70°C)
8-Pin SOT23-8 (derate 8.9mW/°C above +70°C)......714mW
Operating Temperature Range ...........................-40°C to +85°C 握手英语
..............................+150°C Storage -65°C to +150°C Soldering Temperature (soldering, 10s)..........................+300°C
MAX5407
32-Tap Audio Logarithmic Taper
Digital Potentiometer
_______________________________________________________________________________________3
ELECTRICAL CHARACTERISTICS (continued)
(V DD = +2.7V to +5.5V, V H = V DD , V L = 0, T A = T MIN to T MAX , unless otherwi noted. Typical values are at V DD = +5V and T A = +25°C.)(Note 1)
Note 3:The specifications are only valid for I W less than 100nA of continuous wiper current.Note 4:Measured with 20pF load capacitor.
Note 5:Absolute tolerance is defined as the variation of the attenuation for any given tap from its expected value.Note 6:Tap-to-tap tolerance is defined as the variation between any two adjacent taps from the typical value of 1dB.Note 7:Supply current when f TOGGLE = 2MHz.
Note 8:Supply current when wiper position is not changing.
Typical Operating Characteristics
(V DD = +5V, T A = +25°C, unless otherwi noted.)
小雅鹿鸣100
150
250
200
300350
2
1
3
4
5
WIPER RESISTANCE vs.WIPER VOLTAGE
WIPER VOLTAGE (V)
W I P E R R E S I S T A N C E (Ω)
-0.25
-0.20-0.15-0.10-0.0500.050.100.15-40
-15
10
35
60
85
END-TO-END RESISTANCE %CHANGE vs. TEMPERATURE
M A X 5407 t o c 02
TEMPERATURE (°C)E N E -T O -E N D R E S I S T A N C E C H A N G E (%)
-35
-30-20-25-10-5-1500
8
12
4
16
20
24
28
32
ATTENUATION vs. TAP POSITION
M A X 5407 t o c 03
TAP POSITION
A T T E N U A T I O N (d
B )
M A X 5407朗格朗
32-Tap Audio Logarithmic Taper Digital Potentiometer
Digital Potentiometer Typical Operating Characteristics (continued)
(V DD = +5V, T A = +25°C, unless otherwi noted.)
自然资源保护
-5
应清
-10
-15
-200.001
1
0.01
0.1
10
100
1000松鼠教案
FREQUENCY RESPONSE
FREQUENCY (kHz)
G A I N (d B )
0.00001
0.0001
0.001
0.01
TOTAL HARMONIC DISTORTION + NOISE
vs. FREQUENCY
FREQUENCY (kHz)
T H D +N (%)0.01
1
0.1
10
100
Pin Description
00.150.100.050.200.250.300.350.400.450.50-40
10
-15
35
60
85SUPPLY CURRENT vs. TEMPERATURE
TEMPERATURE (°C)S U P P L Y C U R R E N T (µA )OUTPUT
W
200mV/div
40ns/div TAP-TO-TAP SWITCHING TRANSIENT
M A X 5407 t o c 05
U/D 2V/div
0.050.100.150.200.250.300.350.402.5 3.53.0 4.0 4.5 5.0 5.5
STANDBY SUPPLY CURRENT vs.
SUPPLY VOLTAGE
M A X 5407 t o c 06
SUPPLY VOLTAGE (V)
S T A N D B Y S U P P L Y C U R R E N T (µA )
Detailed Description
Digital Interface Operation
The MAX5407 has two modes of operation when the ri-al interface is active: increment and decrement mode.The rial interface is only active when CS is high.The CS and U/D inputs control the position of the wiper along the resistor array. When CS transitions from low to high, the part will go into increment mode if U/D is
high and into decrement mode if U/D is low. Once the mode is t, the device will remain in that mode until CS goes low again. A low-to-high transition at the U/D pin will increment or decrement the wiper position depend-ing on the mode (Figures 1 and 2).
When the CS input transitions to low (rial interface inactive), the value of the counter is stored and the wiper position is maintained.
MAX5407
32-Tap Audio Logarithmic Taper
Digital Potentiometer
_______________________________________________________________________________________5
Figure 1. Serial Interface Timing Diagram, Increment Mode
Figure 2. Serial Interface Timing Diagram, Decrement Mode
